Hippocampus is a character in Mermaid Melody. It is the true form of Hippo.


Hippo used to be a hippocampus before Sara had stolen the Sealing Key, after it was stolen, he lost the ability to transform into a hippocampus. He finally got the key back in Episode 47 and used the key to transform into back into a hippocampus.

In the second season, Hippo uses his hippocampus form to destroy the Black Beauty Sisters's singing sphere stage sometimes.

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